Here's a recipe for veg. beef soup that has a lot of veggies in it. Perhaps you can start there. Somewhere. Anywhere. You can add as much or little of something as you'd like, and the quantities will depend on that and how much you're making. It would be easy to start with, say, a larger amount of tomatoes, beans, celery and onion and increase the amount of zucchini, spinach and carrots over time. I'm using amounts for a med-sized pot.
1 lb. sirloin, chopped into small pieces
1 cup chopped onion
2 tbs. tomato paste
1 cup chopped carrots
1 cup chopped celery
1 bag baby spinach, stemmed
1 cup chopped zucchini
can red kidney beans
canned diced tomato's
1 tbs. olive oil
1 bay leaf
parsley and pepper to taste
Add oil to hot saute pan and heat over med. until shimmery but not smoking. Add sirloin and brown, aprox. 2 mins. Add onions and tomato paste and saute 2 mins, until onions start to brown on edges. Empty into soup pot. Add a small amount of beef broth to saute pan and scrape up fond, adding to the soup pot. To the soup pot, add carrots, kidney beans, bay leaf and tomatoes (including liquid) and cover with beef broth to two inches above vegs. Bring to a boil and then simmer for 20 mins. Add celery, spinach and zucchini and more broth if needed and return to simmer for 10 minutes. Remove bay leaf and add parsley and pepper to taste.
Ok I'm editing to include a variation if you need to sneak the veggies he won't eat in. If you think he'll flat up refuse things like the carrots, zuccini and spinach, you can do it this way. Before you start the beef, saute the carrots in some olive oil. Add the zuccini, spinach, a pinch of salt and enough beef broth to cover them and simmer for 10 minutes. Put in a blender or food processor and puree. Add into the recipe using in place of some of the beef broth in the first part.
If it will make him more likely to eat it, you can add some potato's and peas too (add potato's with first batch of veggies and frozen peas with second). Red skin potatoes have less starch than white potato's. Rice generally isn't that good unless you can get him to eat wild or brown rice - white rice is pure starch. MIL (who is diabetic and controls hers completely through diet and exercise) swears by baby-spinach salad with fresh tomato's and bleu cheese crumbles.
Add me to the list of people who have watched someone die a very painful death due to complications from diabetes. By the time my grandmother had died, she'd lost her sight, one leg, the other had an open wound from years earlier that couldn't heal, dementia, as well as a myriad of other health problems. She was in her early 60's. It very commonly happens to diabetics who don't control their diabetes. Your husband is taking a lot of chances.
Ok I just mentioned this to MIL (she called) and she said to see a nutritionist after she was diagnosed is the best advice she got. There are also tons and tons of diabetic cookbooks and cooking websites out there and she suggested you just google "diabetic cooking".
Good luck to you and FH.